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import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
 
 
public class Ideone {
    String json = "{\n" +
            "   \"Port\":\n" +
            "   {\n" +
            "       \"@alias\": \"defaultHttp\",\n" +
            "       \"Enabled\": \"true\",\n" +
            "       \"Number\": \"10092\",\n" +
            "       \"Protocol\": \"http\",\n" +
            "       \"KeepAliveTimeout\": \"20000\",\n" +
            "       \"ThreadPool\":\n" +
            "       {\n" +
            "           \"@enabled\": \"false\",\n" +
            "           \"Max\": \"150\",\n" +
            "           \"ThreadPriority\": \"5\"\n" +
            "       },\n" +
            "       \"ExtendedProperties\":\n" +
            "       {\n" +
            "           \"Property\":\n" +
            "           [                         \n" +
            "               {\n" +
            "                   \"@name\": \"connectionTimeout\",\n" +
            "                   \"$\": \"20000\"\n" +
            "               }\n" +
            "           ]\n" +
            "       }\n" +
            "   }\n" +
            "}";
 
    @Test
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        try {
            addKeys("", new ObjectMapper().readTree(json), map);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(map);
    }
 
    private void addKeys(String currentPath, JsonNode jsonNode, Map<String, String> map) {
        if (jsonNode.isObject()) {
            ObjectNode objectNode = (ObjectNode) jsonNode;
            Iterator<Map.Entry<String, JsonNode>> iter = objectNode.fields();
            String pathPrefix = currentPath.isEmpty() ? "" : currentPath + ".";
 
            while (iter.hasNext()) {
                Map.Entry<String, JsonNode> entry = iter.next();
                addKeys(pathPrefix + entry.getKey(), entry.getValue(), map);
            }
        } else if (jsonNode.isArray()) {
            ArrayNode arrayNode = (ArrayNode) jsonNode;
            for (int i = 0; i < arrayNode.size(); i++) {
                addKeys(currentPath + "[" + i + "]", arrayNode.get(i), map);
            }
        } else if (jsonNode.isValueNode()) {
            ValueNode valueNode = (ValueNode) jsonNode;
            map.put(currentPath, valueNode.asText());
        }
    }
}

Main.java:7: error: class Ideone is public, should be declared in a file named Ideone.java
public class Ideone {
       ^
Main.java:46: error: cannot find symbol
    private void addKeys(String currentPath, JsonNode jsonNode, Map<String, String> map) {
                                             ^
  symbol:   class JsonNode
  location: class Ideone
Main.java:35: error: cannot find symbol
    @Test
     ^
  symbol:   class Test
  location: class Ideone
Main.java:39: error: non-static variable json cannot be referenced from a static context
            addKeys("", new ObjectMapper().readTree(json), map);
                                                    ^
Main.java:39: error: cannot find symbol
            addKeys("", new ObjectMapper().readTree(json), map);
                            ^
  symbol:   class ObjectMapper
  location: class Ideone
Main.java:48: error: cannot find symbol
            ObjectNode objectNode = (ObjectNode) jsonNode;
            ^
  symbol:   class ObjectNode
  location: class Ideone
Main.java:48: error: cannot find symbol
            ObjectNode objectNode = (ObjectNode) jsonNode;
                                     ^
  symbol:   class ObjectNode
  location: class Ideone
Main.java:49: error: cannot find symbol
            Iterator<Map.Entry<String, JsonNode>> iter = objectNode.fields();
                                       ^
  symbol:   class JsonNode
  location: class Ideone
Main.java:53: error: cannot find symbol
                Map.Entry<String, JsonNode> entry = iter.next();
                                  ^
  symbol:   class JsonNode
  location: class Ideone
Main.java:57: error: cannot find symbol
            ArrayNode arrayNode = (ArrayNode) jsonNode;
            ^
  symbol:   class ArrayNode
  location: class Ideone
Main.java:57: error: cannot find symbol
            ArrayNode arrayNode = (ArrayNode) jsonNode;
                                   ^
  symbol:   class ArrayNode
  location: class Ideone
Main.java:62: error: cannot find symbol
            ValueNode valueNode = (ValueNode) jsonNode;
            ^
  symbol:   class ValueNode
  location: class Ideone
Main.java:62: error: cannot find symbol
            ValueNode valueNode = (ValueNode) jsonNode;
                                   ^
  symbol:   class ValueNode
  location: class Ideone
13 errors

Standard output is empty